from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, SubmitField, TextAreaField
from wtforms.validators import DataRequired, Length, Email, Regexp, EqualTo
from wtforms import ValidationError
from app.models.user import User

class LoginForm(FlaskForm):
    email = StringField('邮箱', validators=[DataRequired(), Length(1, 64), Email()])
    password = PasswordField('密码', validators=[DataRequired()])
    remember_me = BooleanField('记住我')
    submit = SubmitField('登录')

class RegisterForm(FlaskForm):
    email = StringField('邮箱', validators=[DataRequired(), Length(1, 64), Email()])
    username = StringField('用户名', validators=[
        DataRequired(), Length(1, 64),
        Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0, '用户名只能包含字母、数字、下划线和点号')
    ])
    name = StringField('姓名', validators=[DataRequired(), Length(1, 64)])
    password = PasswordField('密码', validators=[
        DataRequired(), EqualTo('password2', message='两次输入的密码必须一致')
    ])
    password2 = PasswordField('确认密码', validators=[DataRequired()])
    submit = SubmitField('注册')
    
    def validate_email(self, field):
        if User.query.filter_by(email=field.data).first():
            raise ValidationError('该邮箱已被注册')
    
    def validate_username(self, field):
        if User.query.filter_by(username=field.data).first():
            raise ValidationError('该用户名已被使用')

class ProfileForm(FlaskForm):
    name = StringField('姓名', validators=[DataRequired(), Length(1, 64)])
    about_me = TextAreaField('关于我')
    submit = SubmitField('更新资料')

class ChangePasswordForm(FlaskForm):
    old_password = PasswordField('当前密码', validators=[DataRequired()])
    password = PasswordField('新密码', validators=[
        DataRequired(), EqualTo('password2', message='两次输入的密码必须一致')
    ])
    password2 = PasswordField('确认新密码', validators=[DataRequired()])
    submit = SubmitField('更改密码')